﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Linq.Expressions;
using PhoneStore.Entity;

namespace PhoneStore.Presentation.CustomControl
{
    /// <summary>
    /// Follow steps 1a or 1b and then 2 to use this custom control in a XAML file.
    ///
    /// Step 1a) Using this custom control in a XAML file that exists in the current project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:PhoneStore.Presentation.CustomControl"
    ///
    ///
    /// Step 1b) Using this custom control in a XAML file that exists in a different project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:PhoneStore.Presentation.CustomControl;assembly=PhoneStore.Presentation.CustomControl"
    ///
    /// You will also need to add a project reference from the project where the XAML file lives
    /// to this project and Rebuild to avoid compilation errors:
    ///
    ///     Right click on the target project in the Solution Explorer and
    ///     "Add Reference"->"Projects"->[Browse to and select this project]
    ///
    ///
    /// Step 2)
    /// Go ahead and use your control in the XAML file.
    ///
    ///     <MyNamespace:PhoneComboBox/>
    ///
    /// </summary>
    public class PhoneComboBox : ComboBox
    {
        static PhoneComboBox()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(PhoneComboBox), new FrameworkPropertyMetadata(typeof(PhoneComboBox)));
        }

        public Expression<Func<Phone, string>> Property { get; set; }

        public Expression<Func<Phone, bool>> GetSearchExpression()
        {
            ParameterExpression phone = System.Linq.Expressions.Expression.Parameter(typeof(Phone));
            if (this.SelectedValue.ToString() != "<Tất Cả>")
            {                
                System.Linq.Expressions.Expression left =
                    System.Linq.Expressions.Expression.Property
                    (phone, typeof(Phone).GetProperty((Property.Body as MemberExpression).Member.Name));
                ConstantExpression right = System.Linq.Expressions.Expression.Constant
                    (this.Text, typeof(string));
                BinaryExpression isEqual = System.Linq.Expressions.Expression.Equal(left, right);
                return System.Linq.Expressions.Expression.Lambda<Func<Phone, bool>>
                    (isEqual, new ParameterExpression[] { phone });
            }
            else
            {
                ConstantExpression cs = System.Linq.Expressions.Expression.Constant(true, typeof(bool));
                return System.Linq.Expressions.Expression.Lambda<Func<Phone, bool>>
                    (cs, new ParameterExpression[] { phone });
            }
        }

    }
}
